NAVIC
•To meet the positioning, navigation and timing requirements of the nation, ISRO has
established a regional navigation satellite system called Navigation with Indian Constellation
(NAVIC). NAVIC was erstwhile known as Indian Regional Navigation Satellite System (IRNSS).
•NAVIC is designed with a constellation of 7 satellites and a network of ground stations
operating 24 x 7. Three satellites of the constellation are placed in geostationary orbit, at
32.5°E, 83°E and 129.5°E respectively, and four satellites are placed in inclined
geosynchronous orbit with equatorial crossing of 55°E and 111.75°E respectively, with
inclination of 29° (two satellites in each plane). The ground network consists of control
center, precise timing facility, range and integrity monitoring stations, two-way ranging
stations, etc.
•NAVIC offers two services: Standard Position Service (SPS) for civilian users and Restricted
Service (RS) for strategic users. These two services are provided in both L5 (1176.45 MHz)
and S band (2498.028 MHz). NAVIC coverage area includes India and a region up to 1500
km beyond Indian boundary. NAVIC signals are designed to provide user position accuracy
better than 20m (2 ) and timing accuracy better than 50ns (2 ).NAVIC SPS signals are
interoperable with the other global navigation satellite system (GNSS) signals namely GPS,
Glonass, Galileo and BeiDou